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Characteristic resistance curves of aortic valve substitutes facilitate individualized decision for a particular type - Appendix B. Conference discussion
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Characteristic resistance curves of aortic valve substitutes facilitate individualized decision for a particular type - Appendix B. Conference discussion

Ralf-U Kuehnel, H Vanermen and A Wechsler
European journal of cardio-thoracic surgery, v 27(3), pp 455-455
01 Mar 2005
DOI: https://doi.org/10.1016/j.ejcts.2004.12.003
PMID: 15740954
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Wechsler-EurJCardSurg-characteristicResistanceCurves-2004201.99 kB
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Abstract

Cardiac & Cardiovascular Systems Cardiovascular System & Cardiology Life Sciences & Biomedicine Science & Technology Respiratory System Surgery
Dr H. Vanermen (Aalst, Belgium): I’ve got a question about your conclusions. Old ladies, most of the time, have very small annuluses. So most of the time we have the tendency to pick up a valve that’s got better hemodynamic performances even at high cardiac outputs because most elderly people now are getting more and more active, too. Dr Kuehnel: The small annulus diameter with old ladies is a point of interest, but I think then the gradients shows us that the Medtronic valves in the lower flows are better. In other studies, also, the small sizes you need in this situation take good results. Dr Vanermen: One may anticipate more calcification to develop in the porcine valves versus the pericardial valves as well. Dr Kuehnel: Yes. This is an in vitro study following hemodynamic parameters. It is not only one point. We have a discussion picture and you can see here, this is from nonpublished data from another study, you can see here the pericardial valve and the Medtronic Mosaic valve. And you can see here under low-flow condition the pericardial valve opens only a little bit and here it opens greater. And this could be a reason for calcification, yes. Dr Vanermen: It’s a very interesting finding. Dr A. Wechsler (Philadelphia, PA, USA): Did you measure the orifice area of each valve? Dr Kuehnel: Yes, we measured with a Hegar probe; and we visualized this and can planimetrate this area also. Dr Wechsler: And did you find that a 21 is exactly 21? Dr Kuehnel: Yes. The Medtronic Mosaic are 1 mm diameter lower than the pericardial valve each size.

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Web of Science research areas
Cardiac & Cardiovascular Systems
Respiratory System
Surgery
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